UPS Sizing Calculator
Determine the exact VA (Volt-Ampere) rating, Watt capacity, and battery backup runtime required for your Uninterruptible Power Supply (UPS) to protect computers, servers, air compressors, and medical equipment.
UPS Load Parameters
Select a load preset or enter your custom equipment power requirements.
UPS Capacity Rating
1,042 VA
Minimum Wattage Rating: 600 W
UPS Sizing & Air Compressor Load Chart
Understand how Volt-Amperes (VA), Watts, Power Factor (PF), and motor surge requirements (e.g. Air Compressors, Pumps, Servers) affect UPS battery backup sizing.
Core Sizing Formulas
VA_min = Load Watts ÷ PF
Converts real power (Watts) to apparent power (VA) based on Power Factor.
UPS_VA = VA_min × 1.20
Includes a 20% growth buffer to prevent overload and extend runtime.
Surge = Run Watts × 3.0×
Inductive motor loads like air compressors require 3× surge capacity.
Hours = (V × Ah × Eff) ÷ Watts
Calculates battery reserve time for sealed lead-acid or LiFePO4 batteries.
| Equipment Type | Category | Running Watts | Starting Surge | Typ. Power Factor | Rec. UPS VA Rating |
|---|---|---|---|---|---|
| Air Compressor (1 HP, Pancake) Motor Load | Workshop Tools | 1,200 W | 3,600 W | 0.70 PF | 2,200 - 3,000 VA |
| Air Compressor (2 HP, Shop) | Industrial Tools | 2,000 W | 6,000 W | 0.75 PF | 3,500 - 5,000 VA |
| Gaming Desktop + 2x Monitors | Workstation | 650 W | 650 W | 0.80 PF | 1,000 - 1,500 VA |
| Home Server Rack + NAS + Switch | IT & Networking | 850 W | 850 W | 0.85 PF | 1,500 - 2,200 VA |
| Wi-Fi Router + Fiber Modem | Networking | 40 W | 40 W | 0.60 PF | 350 - 500 VA |
| CPAP Machine (Heated Humidifier) | Medical Equipment | 120 W | 120 W | 0.65 PF | 500 - 750 VA |
| Sump Pump (1/3 HP) | Water Drainage | 800 W | 2,400 W | 0.70 PF | 2,000 VA Pure Sine |
| Refrigerator / Freezer | Refrigeration | 700 W | 2,100 W | 0.70 PF | 1,500 - 2,000 VA |
Essential UPS & Power Protection Gear
Top-rated Uninterruptible Power Supplies, Pure Sine Wave inverters, surge protectors, power monitors, and replacement battery packs from Amazon.
APC / CyberPower 1500VA Battery Backup
Line-interactive 1500VA / 900W battery backup with AVR surge protection for PCs and servers.
Pure Sine Wave PFC Gaming UPS
Delivers clean, true sine wave AC power for high-end active PFC gaming rigs and sensitive audio gear.
Heavy-Duty Metal Surge Protector Strip
Multi-outlet industrial metal surge strip with 4000+ Joules rating and circuit breaker for workshops.
Kill-A-Watt Usage & Electricity Monitor
Digital plug-in monitor to accurately measure exact running watts, VA, and PF of connected devices.
12V Sealed Lead-Acid & LiFePO4 Battery
High-capacity replacement battery cartridges for APC, CyberPower, and Tripp Lite UPS units.